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~ National ~ Semiconductor - Al Kossow's Bitsavers

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15.0 Switching Characteristics (Continued)<br />

Remote DMA (Read, Send Command)<br />

I Tl I T2 I T3 ~~<br />

BSCK~~<br />

ADSO<br />

r-\<br />

~ S<br />

MRD<br />

PWR<br />

PRO<br />

RACK<br />

--<br />

-bpwrl<br />

--<br />

--bpwrh<br />

--<br />

~<br />

-' S<br />

S<br />

'--<br />

..... ... prql<br />

S~ 'r-<br />

~<br />

rakw<br />

--<br />

~<br />

ADO-15 ( AO-A15 ) ( 00-015<br />

~ S TL/F/6562-64<br />

Symbol Parameter Min Max Units<br />

bpwrl Bus Clock to Port Write Low 43 ns<br />

bpwrh Bus Clock to Port Write High 40 ns<br />

prqh<br />

Port Write High to Port<br />

Request High (Note 1)<br />

30 ns<br />

prql<br />

Port Request Low from<br />

Read Acknowledge High<br />

45 ns<br />

rakw<br />

Remote Acknowledge<br />

Read Strobe Pulse Width<br />

20<br />

ns<br />

Note 1: Start of next transfer is dependent on where RACK is generated relative to BSCK and whether a local DMA is pending.<br />

1-46

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